198770123 has 4 divisors (see below), whose sum is σ = 203392728. Its totient is φ = 194147520.

The previous prime is 198770119. The next prime is 198770129. The reversal of 198770123 is 321077891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321077891 = 181 ⋅1773911.

It is a cyclic number.

It is not a de Polignac number, because 198770123 - 2² = 198770119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198770129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2311238 + ... + 2311323.

It is an arithmetic number, because the mean of its divisors is an integer number (50848182).

Almost surely, 2^198770123 is an apocalyptic number.

198770123 is a deficient number, since it is larger than the sum of its proper divisors (4622605).

198770123 is an equidigital number, since it uses as much as digits as its factorization.

198770123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622604.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 198770123 is about 14098.5858510703. The cubic root of 198770123 is about 583.6023546803.

The spelling of 198770123 in words is "one hundred ninety-eight million, seven hundred seventy thousand, one hundred twenty-three".